Harsh shifting from Park to Reverse, Reverse to Drive

My 1988 Olds at times shifts very harshly from P to R or D. These harsh shifts occur only when the car is moving from a standing position – car shifts great from gear to gear while driving. No codes. Any ideas? Could I need to have the transmission screen cleaned? Car has 44k actual miles. Thanks


 Check the vacuum line going to the modulator on the transmission.  The rubber parts of the lines tend to crack and leak.  You must have engine vacuum to the modulator or the shifts will be harsh.  If the lines look good and are connected then remove the connection to the modulator and see if any atf leaks out.


Thank you. I will have this checked.
I appreciate your help!